Can I use only one Android device for sync?
Just for syncing data from account if I loose device, for example. Because on last step I see what I need to add another device to finish.
Opaite Mbohovái (3)
You don't need a second device to sync your bookmarks to the server.
christ1 said
You don't need a second device to sync your bookmarks to the server.
Only bookmarks? What about passwords?
Moambuepyre
Snyc is not really used as a backup option as it is for say syncing some information between Fiefox on two or more devices whether on Android, iOS or desktop.
https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefox